Tom Gayner's position in Costar Group is currently worth $1.71 Million. That's 0.02% of their equity portfolio (123rd largest holding). Tom Gayner acquired their 18.6 Thousand shares between 2021 and 2022. So far they never sold any shares in the company. The stake costed the investor $1.28 Million, netting the investor a gain of 33% so far.